S3 AERODEFENSE LLC

S3 AERODEFENSE LLC specializes in the design, manufacturing, and overhaul of critical aerospace components and subsystems for defense and homeland security applications. The company delivers precision-engineered aircraft parts, including valves, generators, and auxiliary systems, with deep expertise in airframe integration, electrical power systems, and mission-critical avionics support. Their technical capabilities span the full lifecycle of aerospace components—from fabrication of high-integrity metal and composite parts to the overhaul of alternating current generators and outflow valve assemblies used on Coast Guard HC-130J and MH-60T aircraft. They demonstrate proven proficiency in meeting stringent military specifications for durability, environmental resilience, and operational reliability in austere environments. The contractor maintains a consistent and trusted relationship with the Department of Defense, particularly through DLA Aviation, where they supply essential aircraft subsystems and spare components. They also serve the Department of Homeland Security with mission-specific parts for Coast Guard aviation platforms, indicating a focus on maritime patrol and search-and-rescue aircraft sustainment. Their work for DLA Land and Maritime further suggests involvement in ground support equipment and logistics-ready components. S3 AERODEFENSE’s primary industry focus lies in aircraft parts manufacturing (NAICS 336413), aircraft manufacturing (336411), and aircraft engine components (336412), with complementary capabilities in electronic systems (334290, 334416) and fabricated metal products. This positions them as a niche supplier of mission-critical, low-volume, high-reliability components for defense aerospace platforms, particularly those requiring custom engineering and rapid turnaround. As a Wisconsin-based entity structured as a 2K, S3 AERODEFENSE operates without federal certifications but maintains a focused presence in the defense supply chain through direct contract performance. Their geographic location supports efficient logistics to major military and Coast Guard aviation depots, reinforcing their role as a responsive, technically capable small business supplier to national security programs.